Really this concept is just gravity at work. One of the biggest benefits (and most misunderstood concepts) of an overflow is how they maintain steady water levels in the display tank and are self-regulating.
The principles with an external overflow are the same, just the means of getting water over the side of the tank is different and I will get into more detail with towards the end. For the purpose of explaining overflows I am going to use the internal overflow as the example. First is the internal overflow and second is the external overflow. Your typical self-installed overflow will fall into one of two categories. If you’re more interested in how the concept works, then keep reading!
#INKY BOX OVERFLOW INSTALL#
In the case of an internal overflow, it’s worth mentioning that you want to make sure you have enough room for any fittings you plan to install as well, but generally speaking they are all sized to house typical size plumbing fittings anyway. If you have a return pump that’s going to be 500gph, get an overflow rated for at least 500gph, as long as the overflow is big enough it will self-regulate itself to any pump slower. If you’re looking for the simple answer to “What size overflow do I need?” The answer is: Purchase an overflow that is rated for more flow (generally rated in Gallons per Hour) then your return pump will be. I think the hesitation and the question comes in from the fact that how an overflow system works seems complicated though, like most things, once explained it turns out to be pretty simple. One of the most common questions I see is “How big of an overflow do I need to buy” and it’s a bit ironic because the answer is so much simpler than most folks expect it to be. They allow you to hide all your ugly equipment outside of your display tank, allow you to use bigger, better, and more equipment, and they make for a steady water level in your display tank.
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